Probability

The Guaranteed Four

Difficulty
xxxxx xxxxxxx xxxxxxxxxxxxx xxxx xxxx xxx-xxxxx xxxx. x xxxxxx xxxxxxx xxxxxx xxxx; xx xxx xxxxxxx xxxxx xx xxxx, xxxxxxxx xxxxxxx. xxxxxx xxxx xxxxxx, xxx xxx xxxxxxx xxxx xxx xxxx x xxxxxxxxxx \(x\) xx xxxxx xxxxx, xxxxx xxx xxxxx xxx xxxxxxx xxxx xxxxxxx xxxx xxxx. xxxxxx xxx xxxxxx xx xxxx xxxx xx xx xxxxxxxx xxxx xxxxxx xx xxxxxxx? xxxx xx xxxx xxxxxxxx xxxxxxx xxxxxxxxxxx xx xxx xx?

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